1 /******************************************************************************* 2 * 3 * Module Name: nsaccess - Top-level functions for accessing ACPI namespace 4 * 5 ******************************************************************************/ 6 7 /****************************************************************************** 8 * 9 * 1. Copyright Notice 10 * 11 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp. 12 * All rights reserved. 13 * 14 * 2. License 15 * 16 * 2.1. This is your license from Intel Corp. under its intellectual property 17 * rights. You may have additional license terms from the party that provided 18 * you this software, covering your right to use that party's intellectual 19 * property rights. 20 * 21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22 * copy of the source code appearing in this file ("Covered Code") an 23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24 * base code distributed originally by Intel ("Original Intel Code") to copy, 25 * make derivatives, distribute, use and display any portion of the Covered 26 * Code in any form, with the right to sublicense such rights; and 27 * 28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29 * license (with the right to sublicense), under only those claims of Intel 30 * patents that are infringed by the Original Intel Code, to make, use, sell, 31 * offer to sell, and import the Covered Code and derivative works thereof 32 * solely to the minimum extent necessary to exercise the above copyright 33 * license, and in no event shall the patent license extend to any additions 34 * to or modifications of the Original Intel Code. No other license or right 35 * is granted directly or by implication, estoppel or otherwise; 36 * 37 * The above copyright and patent license is granted only if the following 38 * conditions are met: 39 * 40 * 3. Conditions 41 * 42 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43 * Redistribution of source code of any substantial portion of the Covered 44 * Code or modification with rights to further distribute source must include 45 * the above Copyright Notice, the above License, this list of Conditions, 46 * and the following Disclaimer and Export Compliance provision. In addition, 47 * Licensee must cause all Covered Code to which Licensee contributes to 48 * contain a file documenting the changes Licensee made to create that Covered 49 * Code and the date of any change. Licensee must include in that file the 50 * documentation of any changes made by any predecessor Licensee. Licensee 51 * must include a prominent statement that the modification is derived, 52 * directly or indirectly, from Original Intel Code. 53 * 54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55 * Redistribution of source code of any substantial portion of the Covered 56 * Code or modification without rights to further distribute source must 57 * include the following Disclaimer and Export Compliance provision in the 58 * documentation and/or other materials provided with distribution. In 59 * addition, Licensee may not authorize further sublicense of source of any 60 * portion of the Covered Code, and must include terms to the effect that the 61 * license from Licensee to its licensee is limited to the intellectual 62 * property embodied in the software Licensee provides to its licensee, and 63 * not to intellectual property embodied in modifications its licensee may 64 * make. 65 * 66 * 3.3. Redistribution of Executable. Redistribution in executable form of any 67 * substantial portion of the Covered Code or modification must reproduce the 68 * above Copyright Notice, and the following Disclaimer and Export Compliance 69 * provision in the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3.4. Intel retains all right, title, and interest in and to the Original 73 * Intel Code. 74 * 75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76 * Intel shall be used in advertising or otherwise to promote the sale, use or 77 * other dealings in products derived from or relating to the Covered Code 78 * without prior written authorization from Intel. 79 * 80 * 4. Disclaimer and Export Compliance 81 * 82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88 * PARTICULAR PURPOSE. 89 * 90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97 * LIMITED REMEDY. 98 * 99 * 4.3. Licensee shall not export, either directly or indirectly, any of this 100 * software or system incorporating such software without first obtaining any 101 * required license or other approval from the U. S. Department of Commerce or 102 * any other agency or department of the United States Government. In the 103 * event Licensee exports any such software from the United States or 104 * re-exports any such software from a foreign destination, Licensee shall 105 * ensure that the distribution and export/re-export of the software is in 106 * compliance with all laws, regulations, orders, or other restrictions of the 107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108 * any of its subsidiaries will export/re-export any technical data, process, 109 * software, or service, directly or indirectly, to any country for which the 110 * United States government or any agency thereof requires an export license, 111 * other governmental approval, or letter of assurance, without first obtaining 112 * such license, approval or letter. 113 * 114 ***************************************************************************** 115 * 116 * Alternatively, you may choose to be licensed under the terms of the 117 * following license: 118 * 119 * Redistribution and use in source and binary forms, with or without 120 * modification, are permitted provided that the following conditions 121 * are met: 122 * 1. Redistributions of source code must retain the above copyright 123 * notice, this list of conditions, and the following disclaimer, 124 * without modification. 125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 126 * substantially similar to the "NO WARRANTY" disclaimer below 127 * ("Disclaimer") and any redistribution must be conditioned upon 128 * including a substantially similar Disclaimer requirement for further 129 * binary redistribution. 130 * 3. Neither the names of the above-listed copyright holders nor the names 131 * of any contributors may be used to endorse or promote products derived 132 * from this software without specific prior written permission. 133 * 134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145 * 146 * Alternatively, you may choose to be licensed under the terms of the 147 * GNU General Public License ("GPL") version 2 as published by the Free 148 * Software Foundation. 149 * 150 *****************************************************************************/ 151 152 #include "acpi.h" 153 #include "accommon.h" 154 #include "amlcode.h" 155 #include "acnamesp.h" 156 #include "acdispat.h" 157 158 #ifdef ACPI_ASL_COMPILER 159 #include "acdisasm.h" 160 #endif 161 162 #define _COMPONENT ACPI_NAMESPACE 163 ACPI_MODULE_NAME ("nsaccess") 164 165 166 /******************************************************************************* 167 * 168 * FUNCTION: AcpiNsRootInitialize 169 * 170 * PARAMETERS: None 171 * 172 * RETURN: Status 173 * 174 * DESCRIPTION: Allocate and initialize the default root named objects 175 * 176 * MUTEX: Locks namespace for entire execution 177 * 178 ******************************************************************************/ 179 180 ACPI_STATUS 181 AcpiNsRootInitialize ( 182 void) 183 { 184 ACPI_STATUS Status; 185 const ACPI_PREDEFINED_NAMES *InitVal = NULL; 186 ACPI_NAMESPACE_NODE *NewNode; 187 ACPI_OPERAND_OBJECT *ObjDesc; 188 ACPI_STRING Val = NULL; 189 190 191 ACPI_FUNCTION_TRACE (NsRootInitialize); 192 193 194 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); 195 if (ACPI_FAILURE (Status)) 196 { 197 return_ACPI_STATUS (Status); 198 } 199 200 /* 201 * The global root ptr is initially NULL, so a non-NULL value indicates 202 * that AcpiNsRootInitialize() has already been called; just return. 203 */ 204 if (AcpiGbl_RootNode) 205 { 206 Status = AE_OK; 207 goto UnlockAndExit; 208 } 209 210 /* 211 * Tell the rest of the subsystem that the root is initialized 212 * (This is OK because the namespace is locked) 213 */ 214 AcpiGbl_RootNode = &AcpiGbl_RootNodeStruct; 215 216 /* Enter the pre-defined names in the name table */ 217 218 ACPI_DEBUG_PRINT ((ACPI_DB_INFO, 219 "Entering predefined entries into namespace\n")); 220 221 for (InitVal = AcpiGbl_PreDefinedNames; InitVal->Name; InitVal++) 222 { 223 /* _OSI is optional for now, will be permanent later */ 224 225 if (!strcmp (InitVal->Name, "_OSI") && !AcpiGbl_CreateOsiMethod) 226 { 227 continue; 228 } 229 230 Status = AcpiNsLookup (NULL, ACPI_CAST_PTR (char, InitVal->Name), 231 InitVal->Type, ACPI_IMODE_LOAD_PASS2, ACPI_NS_NO_UPSEARCH, 232 NULL, &NewNode); 233 if (ACPI_FAILURE (Status)) 234 { 235 ACPI_EXCEPTION ((AE_INFO, Status, 236 "Could not create predefined name %s", 237 InitVal->Name)); 238 continue; 239 } 240 241 /* 242 * Name entered successfully. If entry in PreDefinedNames[] specifies 243 * an initial value, create the initial value. 244 */ 245 if (InitVal->Val) 246 { 247 Status = AcpiOsPredefinedOverride (InitVal, &Val); 248 if (ACPI_FAILURE (Status)) 249 { 250 ACPI_ERROR ((AE_INFO, 251 "Could not override predefined %s", 252 InitVal->Name)); 253 } 254 255 if (!Val) 256 { 257 Val = InitVal->Val; 258 } 259 260 /* 261 * Entry requests an initial value, allocate a 262 * descriptor for it. 263 */ 264 ObjDesc = AcpiUtCreateInternalObject (InitVal->Type); 265 if (!ObjDesc) 266 { 267 Status = AE_NO_MEMORY; 268 goto UnlockAndExit; 269 } 270 271 /* 272 * Convert value string from table entry to 273 * internal representation. Only types actually 274 * used for initial values are implemented here. 275 */ 276 switch (InitVal->Type) 277 { 278 case ACPI_TYPE_METHOD: 279 280 ObjDesc->Method.ParamCount = (UINT8) ACPI_TO_INTEGER (Val); 281 ObjDesc->Common.Flags |= AOPOBJ_DATA_VALID; 282 283 #if defined (ACPI_ASL_COMPILER) 284 285 /* Save the parameter count for the iASL compiler */ 286 287 NewNode->Value = ObjDesc->Method.ParamCount; 288 #else 289 /* Mark this as a very SPECIAL method */ 290 291 ObjDesc->Method.InfoFlags = ACPI_METHOD_INTERNAL_ONLY; 292 ObjDesc->Method.Dispatch.Implementation = AcpiUtOsiImplementation; 293 #endif 294 break; 295 296 case ACPI_TYPE_INTEGER: 297 298 ObjDesc->Integer.Value = ACPI_TO_INTEGER (Val); 299 break; 300 301 case ACPI_TYPE_STRING: 302 303 /* Build an object around the static string */ 304 305 ObjDesc->String.Length = (UINT32) strlen (Val); 306 ObjDesc->String.Pointer = Val; 307 ObjDesc->Common.Flags |= AOPOBJ_STATIC_POINTER; 308 break; 309 310 case ACPI_TYPE_MUTEX: 311 312 ObjDesc->Mutex.Node = NewNode; 313 ObjDesc->Mutex.SyncLevel = (UINT8) (ACPI_TO_INTEGER (Val) - 1); 314 315 /* Create a mutex */ 316 317 Status = AcpiOsCreateMutex (&ObjDesc->Mutex.OsMutex); 318 if (ACPI_FAILURE (Status)) 319 { 320 AcpiUtRemoveReference (ObjDesc); 321 goto UnlockAndExit; 322 } 323 324 /* Special case for ACPI Global Lock */ 325 326 if (strcmp (InitVal->Name, "_GL_") == 0) 327 { 328 AcpiGbl_GlobalLockMutex = ObjDesc; 329 330 /* Create additional counting semaphore for global lock */ 331 332 Status = AcpiOsCreateSemaphore ( 333 1, 0, &AcpiGbl_GlobalLockSemaphore); 334 if (ACPI_FAILURE (Status)) 335 { 336 AcpiUtRemoveReference (ObjDesc); 337 goto UnlockAndExit; 338 } 339 } 340 break; 341 342 default: 343 344 ACPI_ERROR ((AE_INFO, "Unsupported initial type value 0x%X", 345 InitVal->Type)); 346 AcpiUtRemoveReference (ObjDesc); 347 ObjDesc = NULL; 348 continue; 349 } 350 351 /* Store pointer to value descriptor in the Node */ 352 353 Status = AcpiNsAttachObject (NewNode, ObjDesc, 354 ObjDesc->Common.Type); 355 356 /* Remove local reference to the object */ 357 358 AcpiUtRemoveReference (ObjDesc); 359 } 360 } 361 362 363 UnlockAndExit: 364 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); 365 366 /* Save a handle to "_GPE", it is always present */ 367 368 if (ACPI_SUCCESS (Status)) 369 { 370 Status = AcpiNsGetNode (NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH, 371 &AcpiGbl_FadtGpeDevice); 372 } 373 374 return_ACPI_STATUS (Status); 375 } 376 377 378 /******************************************************************************* 379 * 380 * FUNCTION: AcpiNsLookup 381 * 382 * PARAMETERS: ScopeInfo - Current scope info block 383 * Pathname - Search pathname, in internal format 384 * (as represented in the AML stream) 385 * Type - Type associated with name 386 * InterpreterMode - IMODE_LOAD_PASS2 => add name if not found 387 * Flags - Flags describing the search restrictions 388 * WalkState - Current state of the walk 389 * ReturnNode - Where the Node is placed (if found 390 * or created successfully) 391 * 392 * RETURN: Status 393 * 394 * DESCRIPTION: Find or enter the passed name in the name space. 395 * Log an error if name not found in Exec mode. 396 * 397 * MUTEX: Assumes namespace is locked. 398 * 399 ******************************************************************************/ 400 401 ACPI_STATUS 402 AcpiNsLookup ( 403 ACPI_GENERIC_STATE *ScopeInfo, 404 char *Pathname, 405 ACPI_OBJECT_TYPE Type, 406 ACPI_INTERPRETER_MODE InterpreterMode, 407 UINT32 Flags, 408 ACPI_WALK_STATE *WalkState, 409 ACPI_NAMESPACE_NODE **ReturnNode) 410 { 411 ACPI_STATUS Status; 412 char *Path = Pathname; 413 char *ExternalPath; 414 ACPI_NAMESPACE_NODE *PrefixNode; 415 ACPI_NAMESPACE_NODE *CurrentNode = NULL; 416 ACPI_NAMESPACE_NODE *ThisNode = NULL; 417 UINT32 NumSegments; 418 UINT32 NumCarats; 419 ACPI_NAME SimpleName; 420 ACPI_OBJECT_TYPE TypeToCheckFor; 421 ACPI_OBJECT_TYPE ThisSearchType; 422 UINT32 SearchParentFlag = ACPI_NS_SEARCH_PARENT; 423 UINT32 LocalFlags; 424 425 426 ACPI_FUNCTION_TRACE (NsLookup); 427 428 429 if (!ReturnNode) 430 { 431 return_ACPI_STATUS (AE_BAD_PARAMETER); 432 } 433 434 LocalFlags = Flags & 435 ~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND | 436 ACPI_NS_SEARCH_PARENT); 437 *ReturnNode = ACPI_ENTRY_NOT_FOUND; 438 AcpiGbl_NsLookupCount++; 439 440 if (!AcpiGbl_RootNode) 441 { 442 return_ACPI_STATUS (AE_NO_NAMESPACE); 443 } 444 445 /* Get the prefix scope. A null scope means use the root scope */ 446 447 if ((!ScopeInfo) || 448 (!ScopeInfo->Scope.Node)) 449 { 450 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 451 "Null scope prefix, using root node (%p)\n", 452 AcpiGbl_RootNode)); 453 454 PrefixNode = AcpiGbl_RootNode; 455 } 456 else 457 { 458 PrefixNode = ScopeInfo->Scope.Node; 459 if (ACPI_GET_DESCRIPTOR_TYPE (PrefixNode) != ACPI_DESC_TYPE_NAMED) 460 { 461 ACPI_ERROR ((AE_INFO, "%p is not a namespace node [%s]", 462 PrefixNode, AcpiUtGetDescriptorName (PrefixNode))); 463 return_ACPI_STATUS (AE_AML_INTERNAL); 464 } 465 466 if (!(Flags & ACPI_NS_PREFIX_IS_SCOPE)) 467 { 468 /* 469 * This node might not be a actual "scope" node (such as a 470 * Device/Method, etc.) It could be a Package or other object 471 * node. Backup up the tree to find the containing scope node. 472 */ 473 while (!AcpiNsOpensScope (PrefixNode->Type) && 474 PrefixNode->Type != ACPI_TYPE_ANY) 475 { 476 PrefixNode = PrefixNode->Parent; 477 } 478 } 479 } 480 481 /* Save type. TBD: may be no longer necessary */ 482 483 TypeToCheckFor = Type; 484 485 /* 486 * Begin examination of the actual pathname 487 */ 488 if (!Pathname) 489 { 490 /* A Null NamePath is allowed and refers to the root */ 491 492 NumSegments = 0; 493 ThisNode = AcpiGbl_RootNode; 494 Path = ""; 495 496 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 497 "Null Pathname (Zero segments), Flags=%X\n", Flags)); 498 } 499 else 500 { 501 /* 502 * Name pointer is valid (and must be in internal name format) 503 * 504 * Check for scope prefixes: 505 * 506 * As represented in the AML stream, a namepath consists of an 507 * optional scope prefix followed by a name segment part. 508 * 509 * If present, the scope prefix is either a Root Prefix (in 510 * which case the name is fully qualified), or one or more 511 * Parent Prefixes (in which case the name's scope is relative 512 * to the current scope). 513 */ 514 if (*Path == (UINT8) AML_ROOT_PREFIX) 515 { 516 /* Pathname is fully qualified, start from the root */ 517 518 ThisNode = AcpiGbl_RootNode; 519 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 520 521 /* Point to name segment part */ 522 523 Path++; 524 525 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 526 "Path is absolute from root [%p]\n", ThisNode)); 527 } 528 else 529 { 530 /* Pathname is relative to current scope, start there */ 531 532 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 533 "Searching relative to prefix scope [%4.4s] (%p)\n", 534 AcpiUtGetNodeName (PrefixNode), PrefixNode)); 535 536 /* 537 * Handle multiple Parent Prefixes (carat) by just getting 538 * the parent node for each prefix instance. 539 */ 540 ThisNode = PrefixNode; 541 NumCarats = 0; 542 while (*Path == (UINT8) AML_PARENT_PREFIX) 543 { 544 /* Name is fully qualified, no search rules apply */ 545 546 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 547 548 /* 549 * Point past this prefix to the name segment 550 * part or the next Parent Prefix 551 */ 552 Path++; 553 554 /* Backup to the parent node */ 555 556 NumCarats++; 557 ThisNode = ThisNode->Parent; 558 if (!ThisNode) 559 { 560 /* 561 * Current scope has no parent scope. Externalize 562 * the internal path for error message. 563 */ 564 Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, Pathname, 565 NULL, &ExternalPath); 566 if (ACPI_SUCCESS (Status)) 567 { 568 ACPI_ERROR ((AE_INFO, 569 "%s: Path has too many parent prefixes (^)", 570 ExternalPath)); 571 572 ACPI_FREE (ExternalPath); 573 } 574 575 return_ACPI_STATUS (AE_NOT_FOUND); 576 } 577 } 578 579 if (SearchParentFlag == ACPI_NS_NO_UPSEARCH) 580 { 581 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 582 "Search scope is [%4.4s], path has %u carat(s)\n", 583 AcpiUtGetNodeName (ThisNode), NumCarats)); 584 } 585 } 586 587 /* 588 * Determine the number of ACPI name segments in this pathname. 589 * 590 * The segment part consists of either: 591 * - A Null name segment (0) 592 * - A DualNamePrefix followed by two 4-byte name segments 593 * - A MultiNamePrefix followed by a byte indicating the 594 * number of segments and the segments themselves. 595 * - A single 4-byte name segment 596 * 597 * Examine the name prefix opcode, if any, to determine the number of 598 * segments. 599 */ 600 switch (*Path) 601 { 602 case 0: 603 /* 604 * Null name after a root or parent prefixes. We already 605 * have the correct target node and there are no name segments. 606 */ 607 NumSegments = 0; 608 Type = ThisNode->Type; 609 610 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 611 "Prefix-only Pathname (Zero name segments), Flags=%X\n", 612 Flags)); 613 break; 614 615 case AML_DUAL_NAME_PREFIX: 616 617 /* More than one NameSeg, search rules do not apply */ 618 619 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 620 621 /* Two segments, point to first name segment */ 622 623 NumSegments = 2; 624 Path++; 625 626 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 627 "Dual Pathname (2 segments, Flags=%X)\n", Flags)); 628 break; 629 630 case AML_MULTI_NAME_PREFIX: 631 632 /* More than one NameSeg, search rules do not apply */ 633 634 SearchParentFlag = ACPI_NS_NO_UPSEARCH; 635 636 /* Extract segment count, point to first name segment */ 637 638 Path++; 639 NumSegments = (UINT32) (UINT8) *Path; 640 Path++; 641 642 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 643 "Multi Pathname (%u Segments, Flags=%X)\n", 644 NumSegments, Flags)); 645 break; 646 647 default: 648 /* 649 * Not a Null name, no Dual or Multi prefix, hence there is 650 * only one name segment and Pathname is already pointing to it. 651 */ 652 NumSegments = 1; 653 654 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 655 "Simple Pathname (1 segment, Flags=%X)\n", Flags)); 656 break; 657 } 658 659 ACPI_DEBUG_EXEC (AcpiNsPrintPathname (NumSegments, Path)); 660 } 661 662 663 /* 664 * Search namespace for each segment of the name. Loop through and 665 * verify (or add to the namespace) each name segment. 666 * 667 * The object type is significant only at the last name 668 * segment. (We don't care about the types along the path, only 669 * the type of the final target object.) 670 */ 671 ThisSearchType = ACPI_TYPE_ANY; 672 CurrentNode = ThisNode; 673 while (NumSegments && CurrentNode) 674 { 675 NumSegments--; 676 if (!NumSegments) 677 { 678 /* This is the last segment, enable typechecking */ 679 680 ThisSearchType = Type; 681 682 /* 683 * Only allow automatic parent search (search rules) if the caller 684 * requested it AND we have a single, non-fully-qualified NameSeg 685 */ 686 if ((SearchParentFlag != ACPI_NS_NO_UPSEARCH) && 687 (Flags & ACPI_NS_SEARCH_PARENT)) 688 { 689 LocalFlags |= ACPI_NS_SEARCH_PARENT; 690 } 691 692 /* Set error flag according to caller */ 693 694 if (Flags & ACPI_NS_ERROR_IF_FOUND) 695 { 696 LocalFlags |= ACPI_NS_ERROR_IF_FOUND; 697 } 698 699 /* Set override flag according to caller */ 700 701 if (Flags & ACPI_NS_OVERRIDE_IF_FOUND) 702 { 703 LocalFlags |= ACPI_NS_OVERRIDE_IF_FOUND; 704 } 705 } 706 707 /* Extract one ACPI name from the front of the pathname */ 708 709 ACPI_MOVE_32_TO_32 (&SimpleName, Path); 710 711 /* Try to find the single (4 character) ACPI name */ 712 713 Status = AcpiNsSearchAndEnter (SimpleName, WalkState, CurrentNode, 714 InterpreterMode, ThisSearchType, LocalFlags, &ThisNode); 715 if (ACPI_FAILURE (Status)) 716 { 717 if (Status == AE_NOT_FOUND) 718 { 719 /* Name not found in ACPI namespace */ 720 721 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 722 "Name [%4.4s] not found in scope [%4.4s] %p\n", 723 (char *) &SimpleName, (char *) &CurrentNode->Name, 724 CurrentNode)); 725 } 726 727 #ifdef ACPI_ASL_COMPILER 728 /* 729 * If this ACPI name already exists within the namespace as an 730 * external declaration, then mark the external as a conflicting 731 * declaration and proceed to process the current node as if it did 732 * not exist in the namespace. If this node is not processed as 733 * normal, then it could cause improper namespace resolution 734 * by failing to open a new scope. 735 */ 736 if (AcpiGbl_DisasmFlag && 737 (Status == AE_ALREADY_EXISTS) && 738 ((ThisNode->Flags & ANOBJ_IS_EXTERNAL) || 739 (WalkState && WalkState->Opcode == AML_EXTERNAL_OP))) 740 { 741 ThisNode->Flags &= ~ANOBJ_IS_EXTERNAL; 742 ThisNode->Type = (UINT8)ThisSearchType; 743 if (WalkState->Opcode != AML_EXTERNAL_OP) 744 { 745 AcpiDmMarkExternalConflict (ThisNode); 746 } 747 break; 748 } 749 #endif 750 751 *ReturnNode = ThisNode; 752 return_ACPI_STATUS (Status); 753 } 754 755 /* More segments to follow? */ 756 757 if (NumSegments > 0) 758 { 759 /* 760 * If we have an alias to an object that opens a scope (such as a 761 * device or processor), we need to dereference the alias here so 762 * that we can access any children of the original node (via the 763 * remaining segments). 764 */ 765 if (ThisNode->Type == ACPI_TYPE_LOCAL_ALIAS) 766 { 767 if (!ThisNode->Object) 768 { 769 return_ACPI_STATUS (AE_NOT_EXIST); 770 } 771 772 if (AcpiNsOpensScope (((ACPI_NAMESPACE_NODE *) 773 ThisNode->Object)->Type)) 774 { 775 ThisNode = (ACPI_NAMESPACE_NODE *) ThisNode->Object; 776 } 777 } 778 } 779 780 /* Special handling for the last segment (NumSegments == 0) */ 781 782 else 783 { 784 /* 785 * Sanity typecheck of the target object: 786 * 787 * If 1) This is the last segment (NumSegments == 0) 788 * 2) And we are looking for a specific type 789 * (Not checking for TYPE_ANY) 790 * 3) Which is not an alias 791 * 4) Which is not a local type (TYPE_SCOPE) 792 * 5) And the type of target object is known (not TYPE_ANY) 793 * 6) And target object does not match what we are looking for 794 * 795 * Then we have a type mismatch. Just warn and ignore it. 796 */ 797 if ((TypeToCheckFor != ACPI_TYPE_ANY) && 798 (TypeToCheckFor != ACPI_TYPE_LOCAL_ALIAS) && 799 (TypeToCheckFor != ACPI_TYPE_LOCAL_METHOD_ALIAS) && 800 (TypeToCheckFor != ACPI_TYPE_LOCAL_SCOPE) && 801 (ThisNode->Type != ACPI_TYPE_ANY) && 802 (ThisNode->Type != TypeToCheckFor)) 803 { 804 /* Complain about a type mismatch */ 805 806 ACPI_WARNING ((AE_INFO, 807 "NsLookup: Type mismatch on %4.4s (%s), searching for (%s)", 808 ACPI_CAST_PTR (char, &SimpleName), 809 AcpiUtGetTypeName (ThisNode->Type), 810 AcpiUtGetTypeName (TypeToCheckFor))); 811 } 812 813 /* 814 * If this is the last name segment and we are not looking for a 815 * specific type, but the type of found object is known, use that 816 * type to (later) see if it opens a scope. 817 */ 818 if (Type == ACPI_TYPE_ANY) 819 { 820 Type = ThisNode->Type; 821 } 822 } 823 824 /* Point to next name segment and make this node current */ 825 826 Path += ACPI_NAME_SIZE; 827 CurrentNode = ThisNode; 828 } 829 830 /* Always check if we need to open a new scope */ 831 832 if (!(Flags & ACPI_NS_DONT_OPEN_SCOPE) && (WalkState)) 833 { 834 /* 835 * If entry is a type which opens a scope, push the new scope on the 836 * scope stack. 837 */ 838 if (AcpiNsOpensScope (Type)) 839 { 840 Status = AcpiDsScopeStackPush (ThisNode, Type, WalkState); 841 if (ACPI_FAILURE (Status)) 842 { 843 return_ACPI_STATUS (Status); 844 } 845 } 846 } 847 848 *ReturnNode = ThisNode; 849 return_ACPI_STATUS (AE_OK); 850 } 851